[PATCH] rust: support DPDK API

[Etelson, Gregory]

>> There is no DPDK API for RUST yet.
>> My patch  allows RUST application to use native DPDK API.
>> I'll adopt you coding style suggestions in the next patch release.
>>
>
> I have same concerns about rust in DPDK as the Linux kernel.
> What API's are we going to be covered?

The plan is to convert API in demand -
according to RUST applications coverage.

> Will new API's have to have rust support?

The patch converts selected files during DPDK installation. 
All API in the selected files are converted.
That procedure automatically covers all API changes in selected files.

> What about API stability?
>

The raw module works directly with DPDK API.
It's stable.